Abstract

Aims: The CoRoT satellite has announced its fourth transiting planet
(Aigrain et al. 2008, A&A, 488, L43) with space photometry. We
describe and analyse complementary observations of this system performed
to establish the planetary nature of the transiting body and to estimate
the fundamental parameters of the planet and its parent star. Methods: We have analysed high precision radial-velocity data,
ground-based photometry, and high signal-to-noise ratio spectroscopy.
Results: The parent star CoRoT-Exo-4 (2MASS 06484671-0040219) is a
late F-type star of mass of 1.16 M&sun; and radius of 1.17
R&sun;. The planet has a circular orbit with a period of
9.20205 d. The planet radius is 1.19 R_Jup and the mass is 0.72 M_Jup.
It is a gas-giant planet with a ``normal'' internal structure
of mainly H and He. CoRoT-Exo-4b has the second longest period of the
known transiting planets. It is an important discovery since it occupies
an empty area in the mass-period diagram of transiting exoplanets.

Based on observations obtained with CoRoT, a space project operated by
the French Space Agency, CNES, with participation of the Science
Programme of ESA, ESTEC/RSSD, Austria, Belgium, Brazil, Germany and
Spain; and on observations made with the SOPHIE spectrograph at
Observatoire de Haute Provence, France (PNP.07B.MOUT), and the HARPS
spectrograph at ESO La Silla Observatory (079.C-0127/F).

Table 2 and Fig. 5 are only available in electronic form at
http://www.aanda.org